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Metal drill bit 47 NWKc HSS DIN 345
0000003248
Diameter (mm): 47301 sizes of this drill
33,13,23,33,43,53,63,73,83,944,14,24,34,44,54,64,74,84,955,15,25,35,45,55,65,75,85,966,16,26,36,46,56,66,76,86,977,17,157,27,257,37,47,57,67,77,757,87,988,18,28,258,38,48,58,68,78,88,999,19,29,259,39,49,59,69,79,759,89,91010,110,210,310,410,510,610,710,7510,810,91111,111,211,2511,311,411,511,611,711,811,91212,112,212,312,412,512,612,712,812,91313,113,213,2513,313,413,513,613,713,7513,813,91414,2514,414,514,751515,2515,515,751616,2516,516,751717,2517,517,751818,2518,518,751919,2519,519,752020,2520,520,752121,2521,521,752222,2522,522,752323,2523,523,752424,2524,524,752525,2525,525,752626,2526,526,752727,2527,527,752828,2528,528,752929,2529,529,753030,2530,530,753131,2531,531,753232,2532,532,753333,2533,533,753434,2534,534,753535,2535,535,753636,2536,536,753737,2537,537,7537,83838,538,753939,2539,539,754040,2540,54141,54242,54343,54444,54545,54646,546,75474848,54949,55050,55151,55252,553545556575858,55960616263646566676869707172737475767778798081828384858687888990919293949596979899100
€106.82 tax inc.
Net price: €86.84
Description
DIAMETER Ø47 mm
MORSE TAPER MT4
OVERALL LENGTH 364 mm
FLUTE LENGTH 215 mm
Technical specifications of the Ø47 mm drill bit
Twist drill with Morse taper shank
| TECHNICAL DATA | |
|---|---|
| Diameter | Ø47 NWKc HSS |
| Standard | DIN 345 |
| Drill type | NWKc — twist drill with taper shank |
| Material | HSS (high-speed steel) |
| Overall length l1 | 364 mm |
| Flute length l2 | 215 mm |
| Morse taper | MT4 |
| Point angle | 118° |
| Diameter tolerance | h8 |
| Cutting direction | Right-hand |
Ø47 mm HSS metal drill bit – Morse taper MT4
Product description and key benefits
The Ø47 mm twist drill is an industrial NWKc cutting tool designed for drilling large-diameter holes in structural and alloy steels. The Morse taper shank provides rigid, self-holding mounting in the spindle — without the risk of slipping at maximum cutting torque. The Ø47 Morse taper drill is suitable for pillar and box-column drilling machines used in industrial facilities.
Key benefits of the Ø47 mm metal drill bit
- HSS high-speed steel — enables stable cutting of materials with tensile strengths up to 800 MPa without loss of cutting edge hardness
- Self-holding Morse taper shank — eliminates tool slippage and transmits full torque directly to the cutting edges
- Full compliance with DIN 345 — ensures interchangeability and compatibility with reduction sleeves and Morse taper spindles
- General-purpose cutting geometry with a 118° point angle — suitable for structural, low-alloy, and medium-carbon steels, gray cast iron, and aluminum
- Repeatable hole size within tolerance class h8 — precision manufacturing ensures consistent dimensions in batch and single-part production
- Extended tool life with emulsion cooling — using coolant increases cutting edge life by up to 2.5 times compared with dry drilling
The Ø47 mm twist drill is used in structural steel fabrication plants, maintenance departments, and industrial machinery service shops. It is suitable for drilling mounting holes in foundation plates, pipe flanges, and machine housings requiring precise fits. It normally produces holes within tolerance class H12 (Ø47.000–Ø47.250 mm range); holes requiring an H7 fit need additional reaming with a finishing reamer.
Morse tapers – dimensions to DIN 228
Dimension table for all Morse tapers MT0–MT6
| Taper | Diameter D [mm] | Length [mm] |
|---|---|---|
| MT0 | 9.045 | 49.8 |
| MT1 | 12.065 | 53.5 |
| MT2 | 17.780 | 64.0 |
| MT3 | 23.825 | 80.5 |
| MT4 | 31.267 | 117.5 |
| MT5 | 44.399 | 149.5 |
| MT6 | 63.348 | 210.0 |
REDUCTION SLEEVES COMPATIBLE WITH THE Ø47 MM DRILL BIT:
| ✓ | MT4 → MT5 — for a spindle with an MT5 socket |
| ✓ | MT4 → MT3 — for a spindle with an MT3 socket |
| ✓ | MT4 drill drift — for removing the drill bit from the spindle |
Cutting data for the Ø47 mm drill bit according to ISO 513
Recommended machining conditions for a diameter of Ø47 mm
| ISO symbol | Workpiece material | Vc [m/min] | f [mm/rev] | n [rpm] | Vf [mm/min] |
|---|---|---|---|---|---|
| P Steel | Structural steel up to 900 N/mm² | 11÷20 | 0.25 | 74÷135 | 18÷34 |
| K Cast iron | Gray cast iron GG20–GG30 | 13÷16 | 0.25 | 88÷108 | 22÷27 |
| N Copper and Al alloys | Cu, CuZn, Al, and alloys | 25÷28 | 0.32÷0.40 | 169÷190 | 54÷76 |
Deep-hole drilling (over 3×D)
When drilling holes deeper than 141 mm (3×Ø47), periodically retract the drill every 1–1.5×D to remove chips. Use ample emulsion cooling (minimum concentration of 6–8%). Reduce the feed by 30–50% from nominal values.
Material compatibility of the Ø47 mm drill bit
Range of workpiece materials and application limitations
✓ Structural steel (S235, S355) up to 900 N/mm²
✓ Gray and ductile cast iron (GG20, GGG40)
✓ Low-carbon and medium-alloy steel
▲ Stainless steel (Vc reduced by 40%, ample coolant)
▲ Aluminum and Al alloys (emulsion coolant required)
✗ Hardened steels above 45 HRC
Frequently asked questions about the Ø47 mm drill bit
The Ø47 mm NWKc drill has a Morse taper shank ending in a tang (wedge), which prevents rotation in the sleeve and makes it easier to eject the drill from the spindle. The NWKa type has a smooth taper without a tang — it is used less frequently, mainly on older machines.
The most commonly used reduction sleeve for the Ø47 MT4 Morse taper drill is MT4→MT5 (for drilling machines with an MT5 spindle). MT4→MT3 sleeves are also available. Use an appropriately sized drill drift to remove the drill from the sleeve.
For a Ø47 mm drill in structural steel with a tensile strength up to 900 N/mm², the recommended cutting speed Vc is 12–20 m/min, corresponding to approximately 81 rpm. Feed: 0.32 mm/rev, feed rate: 26 mm/min. Use peck drilling at depths greater than 3×D.
Product accessories
Reduction sleeve MK6 MK4 1751 PTPa DIN 228
Reference: 1186 In stock < 10 items
€36.84
€45.32 brutto
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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